A work cell has an inbound portion and an outbound portion. In one embodiment, a drag-and-drop workflow allows a user to define multiple source, transformation, and destination processes in a graphical, drag-and-drop workflow editor. The additional information is a syntactic element placed at the slice level or the macroblock level in the coded bitstream, and its meaning is either specific for each present channel or shared by all existing channels. The connection event may occur in response to a portion of a user’s body being positioned between the multiple elements.